Adjustable cutting tool



June l2, 1928. v 1,673,039

R. S. BROWN ADJUSTABLE CUTTING TOOL Filed June 30, 1926 65kg f Z it 1Q ATTORN Ev Patented June 12, 1928.

UNITED STATES PATENTOFFICE.

ROBERT S..BROWN, 0F NEW BRITAIN, CONNECTICUT, ASSIGNOB.' T0 THE NEW BRITAIN MACHINE COMPANY, OF'NEW BRITAIN, CONNECTICUT, A CORPORATION OF CON- NECTICUT.

ADJUSTABLE CUTTING TOOL.

Application iiled June 30, 1926. Serial No. 119,573.

My invention relates to machine tools, and particularly to an adjustable circular forming and cut-oitl tool and holder.

The chief object of the invention is to provide a simple and eilicient construction which will admit of very close adjustment.'

In the accompanying drawings- Fig. lisa plan View of a cutter and the holder therefor, the same being constructed to embody my invention; l Y

Fig. 2 is a sideelevation ofthe parts shown in Fig. 1

Fig. 3 is a plan view, partly in'section on the line 3-3 of Fig. 2;

Fig. 4 is a view partly in section of a modification.

In the form shown inlFigs. l to 3, 1 rep! resents the main body or, holder portion of the tool.

The cutter portion comprises a head 2, which is of circular form save for a cutawayv ortion or notch provided in the periphery t ereof to form the cutting edge or point 3 of the tool. 4 re resents the hub of the cutter. 5 is a toothe portion on the hub, referably in the form oi a worm gear.

A The orward end of the holder Ais bored to `screw bolt.

y observe receive the hub of the cutter. 1* is a slot intersecting said `recess to. form a relatively yieldin integral clamdplng piece l". The forward end of the hol er is bored to receive what I will term a combined adjusting This bolt is provided with'a thread 6, which .tangentia ly enga es the worm 5 on the cutter hub. 7 is t e bolt head, which is preferably located in a recess 8 in the lower side of the holder. 9 is a thread at the opposite end of the bolt for receivin the clamping nut 10. It will be plane somewhat above the point where the thread 6 engages the worm 5, which is a` preferable construction.

In the operation of the tool as thus dethe position indicated inthe if it is found desirable to' adjust the cutting point 3 of the tool up or down, this may be done by releasing the clamping nut 10, then turning the adjusting screw bolt in one d1- that the slot l* vis forined in a` rection or the other, which will cause the cutter to' rotate and thereb shift the position of said cutting point. IVhen the proper adjustment has been effected the clamping nut is again turned down, so as to cause the clamping piece 1b to firmly engage the hub or shank of the cutter. This also prevents the adjustinscrew from rotating, so, that the thread t ereon will coact with the jaw 1b in holding the cutting tool rigidly agalnst unintentional displacement,

In the modification shown in Fig. 4 the clamping piece for the cutter hub is not integral with the holder body, but is in the form of a separate block 1, which is loosely mounted on the body of the adjusting screw bolt under the nut 10, the bore for the adjusting screw bolt being enlarged to receive said block so that it may enga-ge the hub 4 of thecutter whenthe nut 10 is screwed i down, whereby it will function to'grip the hub and lock it in itsadjusted position. This and other modifications may e made without departing from the spirit and scope of the following claims.

While .a tool of this type is of particular value when working on round stock in an automatic screw machine, its use is not lim-`l ited to such a machine.

I claim:

1. A notched -circular cuttin tool having a toothed laterally extendin ub, a cutter holder bored-to receive'said ub, an adjust-l in screw bolt mounted in a borein said ho der and engaging the toothed portion of said hub, a clamping nut on said screw bolt, and a clam ing portion enga ing the peripher7 of sai hub and operatedg by said nut to c amp said cutting tool in the bore of said holder.

2. A notched circular cutting tool havin a circumferentially toothed laterally exten in hub, a lcutter holder bored to receive said hub, an adjustin screw bolt mounted in a bore in saidl ho der andtangentially engaging the toothed portion of said hub, a clamping nut on Vsaid screw bolt, and a clamping portion engagin the periphery of said hub and operated y said nut to clamp said cutting tool in the bore of said l holder. f 3. A notched circular cuttin tool having e a toothed laterally extending ub, a cutter 5 holder bored to receive said hub, an adjustl ing screw bolt mounted in a borev in said holder and engaging the toothed portion of said hub, a clamping nut on said bolt, and a clamping portion operated by said nut to clamp said cuttinOr tool in the bore of said 10 holder, said clamping portion being integral with the body of the holder.

ROBERT S. BROWN. 

